plaintiff

allege sth, argue sth, claim sth, contend sth, seek sth, submit sth

The plaintiff argued that she had suffered significant financial losses due to the company's negligence.

obtain sth, prove sth

The plaintiff proved that the company had damaged her reputation with false advertising.

against the ~

The judge ruled against the plaintiff and dismissed the case entirely.

on behalf of the ~

The attorney submitted the documents on behalf of the plaintiff in the civil case.